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2 Sheets-Sheet l.

Patented Teb. 1l, 1890.

GRINDING MILL.

H. GRABPEL.

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2 Sheets-Sheet 2.

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GRAEPEL.

GRINDING MILL..

Patented F91) peripheral wall is polygonal.

Nrrnn STATES ATENT OFFICE.

HUGO GRAEPEL, OF BUDA-PESTH, AUSTRIA-HUNGARY.

GRINDlNG-IVIILL.

SPECIFICATION forming part of Letters Patent No. 420,934, dated February 11, 1890.

Application tiled November 15, 1888. Serial No. 290,952. (No model.) lPatented in England January l0, 1888, No. 406, and in Austria-Hungary July 17, 1888, No. 21,794 and No. 5,836.

To all whom it may concern.-

Be it known that I, HUGO GRAEPEL, a subject of the Queen of Great Britain, residing at Buda-Pesth, Austria-Hungary, have invented certain new and useful Improvements in Grinding-Mills, (for which I have obtained Letters Patent in Great Britain, January 10, 1888, No. 406, and in Austria-Hungary, July 17, 1888, Nos. 21,794 and 5,8365) andI do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to whichv it appertains to make and use the same, reference being had to the accompanying drawings, and to letters of reference marked thereon, which -form a part of this specication.

Referring to the drawings, Figure 1 shows my improved ore-crusher by a half end elevation and a half vertical transverse section.

2 is a longitudinal section taken on interrupted line d b of Fig. l. Figs. 3 and 4l are vertical transverse sections illustrating slight modifications in the construction of the crusher. l

The invention relates to machines for comminuting solids or for reducing such into a more or less pulverulent form, and more especially to that class of revolving machines designed for the reduction or pulverization of ores, in which a rolling body is employed as a means of reduction or pulverization.

The invention has for its object to construct the machine so as to distribute the weight of the rolling crushers in such manner as .to require a minimum driving-power, and also to increase the general efficiency of the machine.

To these ends the invention consists in structural features and combinations of parts, substantially as hereinafter fully described, and as set forth in the claims.

In the drawings, A and A2 indicate the opposite end plates of the Crusher-drum whose The drum is divided longitudinally into a plurality of radial chambers C, and in the end plate A2 are formed as many feed-apertures J as there are compartments or chambers, four such be ing shown in the drawings, said feed-aper tures opening into a feed-chamber II, formed around the same and revolving with the drum around a stationary feed-hopper P, se-

cured to a guard or feed plate p, as shown .in

Fig. The chambers C are formed by an outer or peripheral wall L2, the radial walls or partitions L L2, (the wall L of which is perforated,) and the end walls A A2.

Between the outer shell K2 ofthe drum and the peripheral walls L3 of the chambers is arranged an intermediate shell K having as many sides as the outer shell K and so arranged as to leave a passage between said intermediate shell K and outer' shell K2, and between shell K and the peripheral wall L3 of the chambers C, said shells being formed of perforated material or woven-wire fabric, the perforations or meshes of the shell K being larger than thosevof shell K2, while the perforations of the radial walls L are larger than the perforations or the meshes of said shell K. The radial partitions are so arranged as to form a passage Z2 between them, one of said partitions-namely, the imperforate partition L2-being so constructed as to gradually enlarge the passage in the direction of the periphery of the drum to the point where said passage merges int-o the peripheral passage lc', while the radial perforated partition L has its upper edge M bent inwardly to vform a passage leading into the chamber.

In each compartment and secured to the peripheral wall L3 thereof I prefer to arrange a radial ledge E,which, as the drum revolves in the direction of the arrow F, takes up the rolling crushers D and drops them again, so that said crushers are made to operate by impact as well as by their rolling or grinding action. Of course these ledges need not be constructed as shown in the drawings, nor need they be secured to the peripheral wall L3 of the crushing-chamber, as they may be differently constructed and secured to the imperforate radial partition L2, for example, and where a crushing action by impact is not desirable these ledges or shelves may be dispensed with. Y

As shown in Fig. l, the material is fed automatically to the several chambers whenever their feed-openings are in or approximately in a vertical plane below the axis of rotation, and the feed of the material to the hopper P may be so regulated as to correspond with IOO the discharge of the reduced material, so as not to overcharge the chambers, the ore or other material being fed to the stationary feed-hopper P from a chute or in any other convenient manner.

The operation of the machine may be briefiy described as follows, the rolling crushers shown being spheres of iron or steel, though other forms of metallic rolling bodies maybe employed. The ore, being fed to the hopper P, passes thence to the chambers C consecutively, the spheres by their rolling action, as well as by impact, crushing and reducing or .pulverizing the ore, the crushed ore passing through the perforations of the radial partition L into the radial passages Z2 as the drum rotates. From the radial passage Z2 the crushed material passes to the peripheral passage 7.5', the finer material passing through the meshes of the peripheral shell K into the peripheral passage 7a2, from which the material that is reduced to the desired degree of iineness passes out through the meshes of the outer shell K2. The material too coarse to pass through the meshes of intermediate shell l and outer shell K2 returns to the crushingchanibers, the alternate ends of said passages being closed by an inclined partition O O2, Fig. l, one end of the intermediate shell K of the alternate sections not extendingquite to the partition, thus leaving a passage O3 for the material to pass bach into the chambers. The partition O O2 has such an inclination as to perform the function of a chute or guide board or plate to direct the material into the slot or opening m, formed between the intermediate shell K and the bent end of the radial partition L.

In practice I preferably employ a perforated directing or guide plate O 02 for the passages k k2 with a view to retarding the return of the material from said passages to the chambers, thereby subjecting it for a longer period of time to the screening action of shells K. K2. Of course it will be understood that the passage m is not sufciently large to allow any of the spheres to pass out from the chambers. The drum is mounted on a shaft B, on or with which it is or may be rotated by any wellknown or desired means.

The construction of the machine may bc somewhatnioditied witlioutdepartiiigfromthe the spirit and nature of my invention. For instance, in Fig. 3 the passages 71: 7a2 are so arran ged that the inateri al therefrom passes into the next succeeding chamber, and in this construction that portion of the peripheral wall L3 of the shell in front oi the ledge E is perforated instead ot one of the radial walls. This is also the case in the construction shown in Fig. 4, which construction ditrers from that shown in Figs. 1 to 3, in that the material is returned to the crushing-chamber, from which it has passed to the passages 7c 7a2, instead of returning to the next succeeding chamber or to any other of the chambers, as shown in Figs. l and 2. It is obvious, also, that the crusher need not necessarily be mounted on a shaft. The end plates may be provided with truniiioiis or journals, or said crusher may be caused to bear on friction-rollers and revolved thereby.

Having described my invention, what I claim is l. In a grinding-mill, a drum divided into a plurality of noncommunicating chambers, loose rolling crusherscontained in said chambers, a screen encompassing all of the chambers, an independent passage between each chamber and the screen, the initial opening of said passage being oi' such dimensions asf to prevent the crushers passing therethrough, substantially as and for the purpose specied. i

2. In a grinding-machine, a drum divided into a plurality of noncommunicating chant bers, loose rolling crushers contained in said chambers, a screen encompassing all the chambers divided by a foiaminous partition into a corresponding numberof sections, and an independent passage connecting cach chamber with its screeirsection, the initial opening of said passage being of such dimensions as to prevent the loose crushers passing therethrough, substantially as and for the purposes specified.

In a grinding-mill, a drum divided into a plurality of chambers, loose rolling crushers contained therein, a screen encompassing all the chambers, and a passage extending around two sides of the chambers and in conimunication therewith and with the screen, the outlet from the chambers to the passages being of such dimensions as to prevent the crusliers passing therethrough, substantially as and for the purposes specified.

et. In a grinding-mill, a drum divided into a plurality of non-communicating chambers, loose rolling crushers contained therein, a screen encompassing all the chambers and divided by a toraniinous partition into a cor responding number of sections, and inter communicating passages extending around two sides of the chambers and coinniunicat ing therewith and with the screenseetions, the outlet from the chambers to the passages being ol' such dimensions as to prevent the rolling erushers passing therethrough, substantially as and for the purposes speciiied.

5. In a grinding-mill, a drum divided into a pluralityot chambers, one ot' whose radial walls is wholly Vor partly perforated, loose rolling Crushers contained within the chain bers, a screen encompassing the saine, and intercominunieating passages extending around two sides otl said chambers and communicating with the screen and with the chambers through the pertorate partitions and through an independent passage, said passage being sufficiently contracted to prevent tlie crusheis passing therethrough, substantially as and for the purposes specified.

f3. In a grinding-mill, a drum divided into IOO IOS

IIO

a plurality of chambers, loose rolling crushers contained therein, ascreen encompassing all Jthe chambers and divided by a foraminous partition into a corresponding number of sections, intercommunicating passages eX- tending around two sides of the chambers and communicating therewith andwith all of v the screen-sections, substantially as and for the purpose specified.

7. In a grinding-mill, a drum divided into a plurality of non-communicating chambers, loose rolling crushers contained therein, superposed screens of varying mesh encompassing all the chambers, and a passage for each of said chambers communicating with both screens, the initial opening` of said passage being of such dimensions as to prevent the crushers passing' therethrough, substantially as and for the purposes specified.

8. In a grinding-mill, a drum divided into a plurality of chambers, loose rolling crushers contained therein, superposed screens of varying mesh encompassing all the chambers, a passage between each two chambers in communication therewith and with the screens, said passage increasing in Width toward its outer end and being sufficiently contracted at its point of communication with the respective chambers to prevent the crushers passing therethrough, substantially as and for ythe purposes specified.

9. In a grinding-mill, a drum divided into a plurality of non-communicating chambers, loose rolling crushers contained therein, su-

perposed screens encompassing all the chambers and divided by a foraminous partition into a number of sections, and intercommunicating passages connecting the chambers with the screen-sections, substantially as and for the purpose specified.

l0. 'A crushing-machine consisting of a revoluble drum composed of concentric screens varying in the size of their meshes, a series of radial chambers formed by perforate and imperforate partitions encompassed by said screens, loose rolling crushers contained in said chambers, and ducts between the concentric screens and peripheral walls of the `chambers for conducting the material passing through the perforate walls of the latter to the inner screens and returning the material too coarse to pass through either screen back into the crushing-chambers, substantially as and for the purpose specified.

11. The combination, with a revoluble drum divided into a plurality of radial crushing-chambers and rolling crushing bodies contained in said chambers, of a radial board for each chamber secured to the peripheral wall thereof and projecting towardthe axis of rotation of the drum, substantiallyas and for the purpose specified.

In testimony whereof I affix my signatureA in presence of two witnesses.

s HUGO GRAEPEL. Witnesses:`

MAURICE BLACK, ALICE EDITH PRATT. 

